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Intro
Under-extrusion shows up as thin walls, gaps, or weak layers. It’s one of the most common problems—and usually easy to solve.
Common causes
- Clogged or partially blocked nozzle
- Worn PTFE tube or extruder gears
- Incorrect E-steps calibration
- Low print temperature
- Moist filament
Quick checks
- Mark and measure filament for E-steps accuracy
- Inspect the hotend for debris or burnt plastic
- Clean drive gears and check tension
- Increase nozzle temp 5–10 °C
Advanced steps
- Check for heat creep (clogs forming over time)
- Replace worn PTFE liners or nozzles
- Lubricate filament path lightly (if allowed)
FAQ
Can slicer settings cause this? Yes—too high speed or too low flow % can mimic under-extrusion.
How to confirm? Print a single-wall cube and measure wall thickness vs. expected.
Wrap-up
Work from easy checks to deeper ones. Once extrusion is consistent, surface quality and strength both improve dramatically.
Thanks for reading! If you have any questions then please drop me a message using the contact form below
Dylan
